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84 BRAT low fuel light ?


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Tom the light is triggered by a thermistor in the sending unit. So sayth the FSM. (no doubt as the varriable resistor for the gauge exploses more winding, the small current passing through them causes them to get hot closing the thermistor?)

The sending unit at the back of the tank will have a white w/ yellow wire. This is the wire for the low fuel light.

The green/black wire is the ground and the black /yellow is the gauge.

If you remove the white/yel wire the lamp should go out - IF the problem is in the sender unit.

Make sure the green/black is getting a good ground (note this wire changes to a black wire at a connector near by.) If the ground is bad - the varriable resistor for the gauge could be seeking a ground through the lamp - thus lighting it.

After thought -if you remove the w/y wire and the gauge quits working then the above senario is the case. I added a ground to my 85 Brat buy running a wire to one of the tank mounting bolts.

HTH

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Guage accuracy, who knows, I don't.

 

Had about 1/4 tank when I picked it up in Wisconsin. Put more gas into it, reads about 1/2 now. Haven't filled it, or drove it more than 30 some miles.

 

Skip,

I'll check out those wires. Bad ground sounds feesible. I'll check it out tomorrow. Just got back from a 345 mile road trip. I be whooped!

 

Thanks all,

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Looked at the conectors at the sending unit, they be corroded. Only 2 wires at sending unit.

Tried a quick-fix and just cut/respliced wires.

 

Low-level light still on!!!!

 

Put another $5:00 worth of go juice in the tank.......Light is still on!

 

 

Told Wife to deal with it!

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Wrong annswer!!!!!!!!!!!!!!!!

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I'm in deep _ _ _ _ ,Now!

 

Help,

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Please!

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Get another guage cluster from the JY, and put it in - I think your problem is with the guage itself, and replacing just that guage is very difficult as it requires removal of the needle, and proper reinstallation - I if would take a lot of fiddling, and probably still not be calibrated properly. Replacing the whole cluster is really pretty easy - cost is about $15 at the JY.

 

GD

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